mayday mayday ; what is this thing on the main stem?

webraider

Member
This is my first grow. today is 43th day from sprout and 12th day from switching to 12/12. soil grow, temperature is almost always between 25-30C and humidity is between 30%-45% most of the time.rarely it downs to 25%.

Is that a fungi or any other harmful organism? If so, what should i do to get rid of this? If not, what is this? should i be worried?
 

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